Downhold cutter blade



FIG. 1 is a view in elevation of the right side of the cutter blade design;

FIG. 2 is a view in elevation of the left side of the cutter blade;

FIG. 3 is a view in elevation of the front side of the design;

FIG. 4 is a view in elevation of the rear side of the design;

FIG. 5 is a top view of the design;

FIG. 6 is a bottom view of the design; and,

FIG. 7 is a perspective view of the right side of the cutter blade. 

The ornamental design for a downhole cutter blade, as shown and described. 